Easiest way is to Delete the Database from within the Pervasive Control Center. To do this:
1. Open PCC.
2. Expand the Engines node.
3. Expand the node for the machine you want to delete the databases on.
4. Expand the Database node.
5. Right click on the database you want to delete and select Delete.
6. You will be asked if you want to delete just the database name or the name and DDFs.

Be sure to do this BEFORE you uninstall for best results. If you uninstall FIRST, then you can delete the DBNames by removing the C:\ProgramData\Pervasive Software\ directory (which usually remains after an uninstall). Further, go into the 32-bit ODBC Administrator and delete any DSN's which point to the PSQL ODBC driver.

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